X2
<protocol> A proprietary modem standard developed by US Robotics for 56 kbps communications.
Not taken up as widely as K56flex and will shortly be superseded by the official V.90 standard.
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| X-1 X11R4 X11R5 X11R6 X.12 | 56 kbps algebra ASCII character table chain Commodore 64 | X.208 X.209 X.21 X.214 X.215 |



